CN114830508A

CN114830508A - Heat dissipation cover for stator, stator assembly comprising heat dissipation cover and motor

Info

Publication number: CN114830508A
Application number: CN202080088750.2A
Authority: CN
Inventors: 元民豪
Original assignee: Amogreentech Co Ltd
Current assignee: Amogreentech Co Ltd
Priority date: 2019-12-19
Filing date: 2020-12-21
Publication date: 2022-07-29
Also published as: KR102565033B1; KR20210078874A; WO2021125909A1; US20230038099A1

Abstract

The invention provides a stator assembly. A stator assembly of an embodiment of the present invention includes: a stator including a stator core and a winding coil, the stator core being cylindrical and having a through-hole to communicate both ends with an outside, a portion of the winding coil protruding more to the outside in a stator core axial direction than both side ends of the stator core, and a remaining portion being located inside the stator core; and heat dissipation covers respectively arranged at two ends of the stator core body to accommodate a part of the protrusion of the winding coil therein to contact with an outer surface of the stator core body. Accordingly, a heat dissipation path that can transfer heat generated at the stator coil or heat transferred to the stator coil to the outside is increased, and heat dissipation efficiency is improved, thereby having excellent heat dissipation characteristics, and a decrease in motor operation efficiency due to heat generation can be minimized or prevented.

Description

Heat dissipation cover for stator, stator assembly comprising heat dissipation cover and motor

Technical Field

The present invention relates to a heat-dissipating cover, and more particularly, to a heat-dissipating cover combined with a motor stator.

Background

A motor is a device that converts electrical energy into mechanical energy. A general structure of the motor is a structure including a stator and a rotor inside a housing, the stator being coupled inside the housing, the stator being implemented by winding a coil around a cylindrical stator core laminated by a plurality of cores. The rotor is disposed inside the stator at a predetermined distance from the inner surface of the stator, and permanent magnets are disposed on the outer peripheral surface of the rotor core along the circumferential direction to react with electromagnetic force generated in the stator coil by applying current. In addition, a rotation shaft is provided at the center of the rotor to transmit the rotational force of the rotor to the outside, and both ends of the rotation shaft are fixed and supported at both sides of the housing.

Generally, heat generated by driving the motor is dissipated by a cooling tool disposed inside the housing, a cooling tool disposed between the housing and the outer side surface of the stator, or the like. However, since both ends of the winding coil coupled to the stator core are disposed to protrude to the outside of the stator core and are placed in the air, it is difficult to rapidly transfer all of the heat generated in the winding coil coupled to the stator core or the heat transferred to the winding coil to the cooling tool side by the heat dissipation structure of the cooling tool as described above, and thus there may be a problem that electromagnetic force loss occurs during driving and driving efficiency of the motor is lowered.

Disclosure of Invention

(problem to be solved)

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a heat radiation cover for a stator assembly, a stator assembly having the same, and a motor, which can increase a heat radiation path that can transmit heat generated in a stator coil inside the motor or heat transmitted to the stator coil to the outside and can improve heat radiation efficiency.

Another object of the present invention is to provide a heat radiation cover for a stator assembly, comprising: it is very easily combined with the stator core to be implemented, thereby improving heat dissipation characteristics while minimizing an increase in manufacturing time or cost due to the provision of the heat dissipation cover.

Further, another object of the present invention is to provide a heat radiation cover for a stator assembly, comprising: the stator core has excellent mechanical strength, adhesive strength, and heat resistance after being bonded thereto, and thus has excellent durability even under high heat and vibration generated during motor operation, thereby exhibiting expected effects for a long period of time.

Another object of the present invention is to provide a heat dissipation cover for a stator assembly, comprising: the insulation property is excellent, and thus the insulation property can be achieved by the heat dissipation cover even though a separate insulation coating is omitted at the end of the winding coil.

(means for solving the problems)

In order to solve the above problem, the present invention provides a stator assembly including: a stator including a stator core and a winding coil, the stator core being cylindrical and having a through-hole to communicate both ends with an outside, a portion of the winding coil protruding more to the outside in a stator core axial direction than both side ends of the stator core, and a remaining portion being located inside the stator core; and heat dissipation covers respectively arranged at two ends of the stator core body to accommodate a part of the protrusion of the winding coil therein to contact with an outer surface of the stator core body.

According to an embodiment of the present invention, the winding coil may be formed by winding a conductive wire, or may be formed by fastening and connecting a plurality of hairpins to each other through a plurality of slots arranged along a circumferential direction of the stator core so as to penetrate both ends of the stator core.

In addition, the heat-dissipating cover may have a heat-dissipating exterior material molded to have an accommodating portion accommodating the one protruding end portion of the winding coil, and a heat-dissipating filling material filling a space between the heat-dissipating exterior material and the accommodated winding coil.

In the heat-dissipating exterior material, a through-hole may be formed in a central portion of the heat-dissipating exterior material, the through-hole corresponding to the through-hole of the stator core, and a housing portion having an open front end may be arranged along a circumferential direction so as to correspond to one end portion of the winding coil protruding therefrom.

The heat dissipating package may be formed by curing a package resin composition containing a first curable base resin and a first heat dissipating filler.

The heat dissipation filler may be formed by curing a heat dissipation filler composition having a second curing base resin and a second heat dissipation filler after the winding coil is accommodated in the heat dissipation outer cover.

In addition, the heat dissipating exterior material may have a tensile strength of 2.5 kg/mm in terms of KS M3015 ² The bending strength is 7.0kg f/mm ² The IZOD impact strength is more than 11 kJ/square meter.

In addition, the heat dissipation casing material may have an insulation resistance of 1.0 × 10 ¹³ Omega is above, arc resistance is above 180 seconds, and heat distortion temperature can be above 190 ℃.

In addition, the heat dissipation filling material can have a volume resistance of 2 × 10 according to ASTM D257 ¹¹ More than omega cm, more than 9 kV/mm in insulation breakdown strength according to ASTM 149 and more than 0.5W/mk in thermal conductivity according to ASTM E1530.

In addition, the heat dissipation cover may be fixed to the stator core by a fastening member.

In addition, the present invention provides a heat radiating cover for a motor stator assembly, which is coupled to one end of a stator core to radiate heat from a winding coil wound around the stator core of a motor, the heat radiating cover comprising: a heat-dissipating exterior material molded to have an accommodating portion accommodating one end portion of the winding coil; and a heat dissipation filling composition disposed in the housing portion to fill a space between the heat dissipation casing and the winding coil after housing one end portion of the winding coil.

According to an embodiment of the present invention, the heat dissipation filler composition includes a second cured base resin, which may be in an uncured or partially cured state.

In addition, the present invention provides a motor including: the stator assembly of the present invention; a rotor accommodated in the through-hole inside the stator core of the stator assembly; and a housing accommodating the stator assembly to be in contact with an outer circumferential surface of a stator core of the stator assembly, and having a cooling passage at a region corresponding to the outer circumferential surface of the stator core.

According to an embodiment of the invention, at least a portion of an exterior face of a heat sink cap within the stator assembly may contact the housing.

(Effect of the invention)

The heat dissipation cover of the present invention increases a heat dissipation path that can transmit heat generated by a stator coil inside a motor or heat transmitted to the stator coil to the outside, and can improve heat dissipation efficiency. In addition, it is very easily combined with the stator core combined with the winding coil, thereby saving process time and cost. Further, the stator core has excellent mechanical strength, adhesive strength, and heat resistance after being bonded thereto, and thus has excellent durability even under high heat and vibration generated during operation of the motor, thereby achieving the intended effect for a long period of time. Further, since the coil has excellent insulating properties, there is an advantage that the insulating properties can be achieved by the cover of the heat-radiating cover even if a separate insulating coating process is not performed on the end of the winding coil, which is particularly practical in a motor using the hairpin winding coil.

Drawings

Fig. 1 is a partial schematic view of a cross section in a rotation axis direction of a general motor, showing a moving path of heat generated in a stator;

fig. 2 is a partial schematic view of a cross section in the direction of the rotation axis of a motor according to an embodiment of the present invention, showing a moving path of heat generated in a stator;

FIG. 3 is a partial schematic view of a cross section in the direction of the rotation axis of the motor according to the embodiment of the present invention;

fig. 4 is a perspective view and a sectional view along a boundary line X-X' of a heat-dissipating cover for a stator according to an embodiment of the present invention;

FIG. 5 is an enlarged partial cross-sectional view of a stator assembly of an embodiment of the present invention;

fig. 6 is a perspective view of a stator assembly and a cross-sectional pattern view of a boundary line X-X' according to an embodiment of the present invention;

FIG. 7 is a cross-sectional schematic view of the boundary line Y-Y' of the stator assembly of FIG. 6; and

fig. 8 is a perspective view of a heat-dissipating cover for a stator and a sectional view of a boundary line X-X' according to an embodiment of the present invention.

Best mode for carrying out the invention

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those having ordinary knowledge in the art to which the present invention pertains can easily carry out the embodiments. The present invention may be embodied in various forms and is not limited to the embodiments described herein. In order to clearly explain the present invention, portions that are not related to the description are omitted in the drawings, and the same reference numerals are given to the same or similar members throughout the specification.

Referring to fig. 1, a typical motor 10 includes a stator assembly 3 and a rotor 2, the stator assembly 3 is disposed inside a casing 4, and the rotor 2 is disposed inside the stator assembly 3 with a gap therebetween. When a current is applied to the motor 10, heat T is generated in addition to electromagnetic force in the winding coil 3b coupled to the stator core 3a, and passes through various paths T through the cooling passage 4a disposed in the casing 4 ₁ 、T ₂ 、T ₄ And (6) heat dissipation is performed. Accordingly, in the winding coil 3b, the portion (a in fig. 1) corresponding to the inside of the stator core 3a smoothly radiates heat, and thus a problem of heat radiation rarely occurs. However, both side ends of the winding coil 3b corresponding to the portion (E of fig. 1) of the winding coil 3b protruding to the outside beyond both side ends of the stator core 3a are in a state of being directly exposed to the air and not being in contact with any object that can conduct heat, and therefore heat is generated at both side ends of the winding coil 3b or heat transferred to the ends can only be conducted throughHeat transfer path T for releasing into air ₃ And (6) dissipating heat. At this time, the efficiency of heat dissipation from the winding coil 3b into the air is very low, so the end portion of the winding coil 3b hardly dissipates the heat, but heat accumulation can be increased, whereby a heat transfer path T can be formed in which a part of the heat is re-transferred to the stator core 3a side in the case where normal heat dissipation by the winding coil 3b is not possible ₄ Such a heat transfer path T ₄ Heat accumulation of the stator assembly 3 is increased, and thus there may be a concern of causing a decrease in motor efficiency.

Accordingly, as shown in fig. 2, the present invention implements the motor 100 by covering both side end portions of the winding coil 132 of the stator assembly 130 with the heat-radiating covers 140, whereby heat at both side end portions of the winding coil 132 can be efficiently radiated to the air through the heat-radiating covers 140. In addition, heat transfer path T for transferring the heat at the end of winding coil 132 to stator core 131 is reduced accordingly ₄ The heat accumulation in stator core 131 and winding coil 132 coupled to the portion corresponding to stator core 131 can be reduced. In addition, it is realized that when a part of the outer face of the heat dissipation cover 140 is in contact with the case 180, the heat generated at the end of the winding coil 132 is directly transferred to the heat transfer path T of the case 180 through the heat dissipation cover 140 ₅ Therefore, the heat dissipation characteristic of the motor can be greatly improved.

Referring to fig. 2 and 3, a motor 100 according to an embodiment of the present invention includes: a stator assembly 160 contacting and disposed on an inner side surface of the housing 180; a rotor 120 which is accommodated in the inner through-hole of the stator core 131 of the stator assembly 160 at intervals; a rotating shaft 110 pressed into the center of the rotor 120; here, in the housing 180, a cooling passage 180a may be provided at a part or all of a region corresponding to the outer circumferential surface of the stator core 131.

The motor 100 according to the embodiment of the present invention may be applied to a motor in a known art without limitation, and may be applied to a driving motor (electric motor) that obtains electric energy as a driving force in a hybrid vehicle or an electric vehicle, as an example.

The housing 180, the rotor 120, and the rotary shaft 110 disposed in the motor 100 may be directly configured or may be appropriately modified to be configured of a housing, a rotor, and a rotary shaft disposed in a known motor. As an example, the rotor 120 may be a rotor of a permanent magnet type synchronous motor adapted to insert a permanent magnet in a rotor core, or may be a rotor of a wound field synchronous motor adapted to wind a rotor coil in a rotor core.

In addition, referring to fig. 3 to 8, the stator assembly 160, 160 ' includes a stator 130, 130 ' and a heat-radiating cover 140, 150 ', and the heat-radiating cover 140, 150 ' is coupled to both side ends of the stator 130, 130 '.

The stator 130, 130' has: the stator cores 131, 131' are formed in a cylindrical shape and have through-holes to communicate both ends with the outside; and winding coils 132, 132 'disposed inside the stator cores 131, 131'; a part corresponding to both side end portions of the winding coil 132, 132 'protrudes further to the outside in the axial direction of the stator core 131, 131' than both side end portions of the stator core 131, 131 ', and the remaining part is located inside the stator core 131, 131'.

The material, shape and size of the stator cores 131 and 131' may be those of the stator cores of a conventional motor, and thus the present invention is not particularly limited. On the other hand, the specific shape of the stator cores 131 and 131 'may be different according to the type of the winding coil 132 or 132', and for example, as shown in fig. 3, in the case where the conductive wire is wound around the stator core 131 to form the winding coil 132, a plurality of grooves formed in parallel in the direction of the rotation axis 110 may be formed on the inner side of the stator core 131 so that the conductive wire is inserted into the inner side of the stator core 131 and then wound. As shown in fig. 5, when winding coil 132 'is formed by connecting winding coils 132' to each other in a hairpin as in stator 130 'arranged in a hairpin winding motor, stator core 131' may have a plurality of slots penetrating both ends of stator core 131 ', and a set of slots formed at predetermined intervals in the circumferential direction may be formed in a plurality of layers in the radial direction of stator core 131'.

As described above, the winding coil 132 may be formed by winding the conductive wire around the inside of the stator core 131, or the winding coil 132 'may be formed by fastening a plurality of hairpins to a plurality of slots disposed in the stator core 131', and then connecting different hairpin ends fastened to any one of the slots to each other by welding or the like. The specific shape, material, size, and the like of the winding coil 132, 132' may be the shape, material, size, and the like of a winding coil for a stator used in a known motor, and thus the present invention is not particularly limited thereto.

In the stators 130 and 130 'implemented as described above, the distal end portions of the winding coils 132 and 132' are exposed to be protruded at both ends in the rotation axis direction, and the heat dissipation covers 140, 150 and 150 'are respectively disposed at both end portions of the stator cores 131 and 131' to accommodate the protruded distal end portions of the winding coils 132 and 132 'therein to be in contact with the outer surfaces of the stator cores 131 and 131'.

In this case, as shown in fig. 3 and 6, the outer surfaces of the heat dissipation covers 140, 150, and 150 ' contacting the stator cores 131 and 131 ' may be both end surfaces of the stator cores 131 and 131 '. Alternatively, as shown in fig. 5, the end face of the stator core 131 may be in contact with a portion of the outer face that is continuous with the end face.

The heat dissipation covers 140, 150, and 150 'are fixed to the stator cores 131 and 131' by

heat dissipation fillers

142 and 152 disposed inside. Alternatively, as shown in fig. 5, the heat-radiating cover 140 ' further includes a fastening member 190, and is fixed to the stator core 131 by the fastening member 190, so that the stator assembly 160 ' can be implemented, and thus, the coupling between the heat-radiating cover 140 ' and the stator core 131 can be further improved against vibration, impact, and the like generated when the motor is operated. In this case, when the fastening member 190 is a known fastening member, it can be used without limitation, and for example, it may be a bolt or a nut.

The heat dissipation covers 140, 150, and 150' coupled to the stator core 131 may include heat

dissipation sheathing materials

141 and 151 and heat

dissipation filling materials

142 and 152, and the heat

dissipation sheathing materials

141 and 151 may be formed to have a receiving part P receiving one end of the protrusion of the winding

coil

132 or 132 ₁ 、P ₂ The heat

dissipation filling materials

142, 152 fill the heat dissipation packageThe space between the material 141, 151 and the received winding

coil

132, 132', 132 ".

In the heat dissipation

outer materials

141 and 151, a through-hole corresponding to the through-hole of the stator cores 131 and 131' is formed in the center, and a receiving part P having an open front end may be disposed along the circumferential direction ₁ 、P ₂ To correspond to the protruding one end portions of the winding coils 132, 132'. On the other hand, fig. 7 shows that a set of winding coils 132', 132 ″ formed in one layer with 4 hairpins is accommodated in one accommodation part P ₂ Unlike fig. 7, the receiving portion formed in the heat dissipating cover may be formed to receive 4 hair clips forming a set, respectively.

The heat dissipation

outer materials

141 and 151 can be used without limitation in the case of conventional heat dissipation plastics having a heat dissipation function. However, the environment-friendly motor, that is, the winding

coil

132, 132', 132 ″ preferably has a heat dissipation property in the case of high heat, a heat resistance property in which shrinkage, deformation, and scratch do not occur in the case of high heat, an insulation property, and a mechanical strength that prevents damage or cracking even when vibration is generated by driving of the motor. Accordingly, the heat dissipation

outer sheathing materials

141 and 151 had tensile strengths of 2.5 kg/mm in accordance with KS M3015 ² More preferably from 3 to 6 kilograms of f/mm ² (ii) a The bending strength was 7.0kg f/mm ² More preferably 8.0 to 12.0 kg/mm ² (ii) a The IZOD impact strength is more than 11kJ per square meter, and more preferably 13 to 18kJ per square meter. The heat

dissipation casing materials

141 and 151 have insulation resistances of 1.0 × 10 ¹³ Omega or more, more preferably 1.0X 10 ¹⁴ Omega or above; the arc resistance is more than 180 seconds; the heat distortion temperature can be above 190 ℃.

The heat dissipation

outer materials

141 and 151 may be used without limitation as long as they have the above-described level or can exhibit physical properties more than those, and may be formed by curing an outer material resin composition having a first curing base resin and a first heat dissipation filler. The basic composition of the exterior material resin composition may be a composition generally called bulk molding compound composition (BMC) without limitation. As an example, the first curing base resin may be one of unsaturated polyester, epoxy resin, acrylic resin, nylon resin, phenol resin, urea resin, melamine resin, silicone resin, urethane resin, or the like, or a mixture thereof, or a copolymer of two or more of these. As a preferred example, the first curing base resin may be an unsaturated polyester. The first curable base resin may be included in an amount of 10 to 20 wt% based on the total weight of the outer material resin composition, but is not limited thereto and may be appropriately changed depending on the kind of the base resin and the target physical property level.

In addition, the first heat dissipation filler can adopt an insulating filler so as to realize heat dissipation characteristics and have insulating characteristics at the same time. As an example, the first heat dissipation filler may include one or more of silicon carbide, magnesium oxide, titanium dioxide, silicon dioxide, aluminum nitride, silicon nitride, boron nitride, aluminum oxide, silicon dioxide, zinc oxide, barium titanate, strontium titanate, beryllium oxide, talc, and manganese oxide, and more particularly, may be talc. The first heat dissipation filler may be included in an amount of 50 to 80 wt%, preferably 60 to 68 wt%, based on the total weight of the exterior material resin composition, thereby further contributing to the mechanical, electrical, and thermal characteristics of the heat dissipation exterior material.

In addition, the exterior material resin composition may further contain a low shrinkage agent in addition to the first cured base resin and the first heat dissipation filler described above. The low shrinkage agent is responsible for minimizing shape deformation such as distortion and shrinkage of the heat dissipation external material at high temperature, and may be contained in an amount of 9 to 12 wt% based on the total weight of the external material resin composition. However, if the content is less than 9 wt%, the heat dissipation outer material is deformed in shape at high temperature and thus there is a concern that a gap may occur between the heat dissipation outer material and the stator core, and thus the heat dissipation characteristics may be degraded. In addition, if the low shrinkage agent content exceeds 12 wt%, the effect of preventing shrinkage is minutely improved, and the content of other components, such as the first heat dissipation filler, is relatively reduced, so that it is difficult to achieve the intended effect of the other components.

The exterior material resin composition may further contain a reinforcing agent for reinforcing the mechanical strength and the insulating property of the heat dissipating exterior material, and the reinforcing agent may be glass fiber, for example. The glass fiber may be contained in an amount of 8 to 11 wt% based on the total weight of the resin composition for the outer material. In addition, if the content is less than 8% by weight, it may be difficult to enhance the mechanical strength and improve the insulation property by the reinforcing agent. In addition, if the glass fiber content exceeds 11 wt%, the mechanical strength improving effect is minutely improved, and the content of other components is relatively reduced, so that it may be difficult to achieve the intended effect of the other components.

In addition, the exterior material resin composition may contain, in addition to the above-mentioned components, additives conventionally added to the bulk molding compound composition, such as a curing agent, a release agent, a thickener, a pigment, and the like, and the specific kind and content of each of the additions may be appropriately changed according to the object, and thus the present invention is not particularly limited.

The heat

dissipation filling materials

142 and 152 may be disposed inside the heat

dissipation sheathing materials

141 and 151, and the heat

dissipation filling materials

142 and 152 may fill spaces between the heat

dissipation sheathing materials

141 and 151 and the protruding end portions of the winding

coils

132, 132', and 132 ″. The heat

dissipation filling material

142, 152 provides a heat transfer path between the heat

dissipation sheathing material

141, 151 and the winding

coil

132, 132', 132 ″, and is responsible for a function of fixing the heat dissipation cap 140, 150 ' to one end of the stator 130, 130 '. The thermal

dissipation filler material

142, 152 may be formed by a thermal

dissipation filler composition

142a, 152 a. The heat

dissipation filler composition

142a, 152a may include a second cured base resin and a second heat dissipation filler. In addition, the heat dissipation filling composition configured of the heat dissipation cap 140, 150 'in a separate object state before being coupled to the stator 130, 130' may be in an uncured a-stage state or a partially cured B-stage state. The heat discharging cover 140, 150 'having the heat discharging

filling composition

142a, 152a in such an uncured or partially cured state may be formed as the heat discharging filling

material

142, 152 while being cured by performing heat treatment and/or light irradiation according to a curing type of the second curing resin after being coupled to one end of the stator 130, 130'.

The second curable base resin may be used without limitation when it is a curable resin, and may be any one of an epoxy resin, an unsaturated polyester resin, a polyurethane resin, and a silicone resin, and more specifically, may be an epoxy resin or an unsaturated polyester resin. In addition, the second curable base resin may be included in an amount of 10 to 70 wt% based on the total weight of the heat

dissipation filler composition

142a, 152a, but is not limited thereto, and may be appropriately changed according to the specific type of the base resin and the level of the target physical properties.

The second heat dissipation filler may be any known heat dissipation filler, and preferably has both of insulation properties and heat dissipation properties, and may include one or more of silicon carbide, magnesium oxide, titanium dioxide, silicon dioxide, aluminum nitride, silicon nitride, boron nitride, aluminum oxide, aluminum hydroxide, silicon dioxide, zinc oxide, barium titanate, strontium titanate, beryllium oxide, and manganese oxide, and more specifically may be aluminum hydroxide. The second heat-dissipating filler may be included in an amount of 20 to 80 wt%, and more preferably, 45 to 68 wt%, based on the total weight of the heat-dissipating

filler compositions

142a and 152a, but is not limited thereto, and may be appropriately changed according to the kind of the heat-dissipating filler, the kind of the cured resin forming the exterior material matrix, and the target physical property level.

The heat

dissipation filler compositions

142a and 152a may further include additives such as a curing agent, a thickener, a filler, and a reinforcing agent in addition to the second curing base resin and the second heat dissipation filler, and the specific kinds and contents of the respective additives may be appropriately changed according to the purpose, and the present invention is not particularly limited thereto.

The heat-dissipating and filling

materials

142 and 152 obtained by curing the heat-dissipating and filling

compositions

142a and 152a have a volume resistance of 2 × 10 according to ASTM D257 ¹¹ The insulation breakdown strength is more than 9 kV/mm according to ASTM 149, and the thermal conductivity coefficient can be more than 0.5W/mk according to ASTM E1530, so that the thermal conductivity coefficient can be more thanMeanwhile, the insulating material has excellent insulating property and thermal conductivity.

Detailed Description

The present invention will be described in more detail by the following examples, but the scope of the present invention should not be limited by the following examples, but should be construed as being useful for understanding the present invention.

(example 1)

In order to manufacture the heat dissipation outer covering material, a heat dissipation outer covering material forming composition including 14 wt% of an unsaturated polyester resin as a first curing base resin, 65 wt% of talc as a first heat dissipation filler, 10 wt% of a low shrinkage agent, 10 wt% of a glass fiber as a reinforcing agent, 0.6 wt% of a curing agent, and 0.4 wt% of a mold release agent was prepared, and then the heat dissipation outer covering material forming composition was injected into a mold designed according to the outer diameter and inner diameter of a stator core and the size of a winding coil, and molding was performed at a temperature of 120 ℃.

In the manufactured heat-dissipating exterior material, in the accommodating part P ₁ The side surface and the lower surface of the heat dissipation filler composition were processed to a predetermined thickness, and then processed at 85 ℃ for 4 hours, thereby producing a B-staged state. In this case, the heat radiation filling composition was prepared using a first agent containing 45 wt% of an epoxy resin as a second curing base resin and 55 wt% of aluminum hydroxide as a second heat radiation filler, and a second agent as a curing agent in a weight ratio of 1: 0.4. Then, heat dissipating covers having prepared heat dissipating exterior materials and heat dissipating filler materials were assembled to both ends of the stator in which the winding coil of copper material was mounted on the stator core, and then heat treatment was performed at 90 ℃ for 3 hours to cure the heat dissipating filler, thereby manufacturing a stator in which the heat dissipating covers were fixed to both ends.

At this time, the heat dissipation exterior material and the heat dissipation filling material manufactured in example 1 were measured to have the physical property values as shown in table 1 below.

(Table 1)

Comparative example 1

A stator in which no treatment was performed on the winding coil protruded to the outside was prepared.

(Experimental example 1)

In the constant temperature and humidity chamber, a current of 10A was applied to the winding coil of the stator of the example and the comparative example for 1 hour, and the temperatures of the left end, the right end, and the outer face of the center portion of the stator were measured after 1 hour.

Specifically, a heat sink is provided on the stator core outer face of the stator, and then the heat sink is pressed with the same jig so that there is no gap at the interface between the stator core outer face and the heat sink. At this time, a TIM having a thermal conductivity of 1.8W/mK is covered at a predetermined thickness on the stator core outer face so that the TIM is located between the core outer face and the heat sink contact face. Further, the length of the heat sink is about the length of the winding coil protruding outward from the stator core, and the heat sink having the length is used, and in the case of example 1, as shown in fig. 2, the outer surface of the heat dissipation outer covering material is brought into contact with the heat sink, and in the case of comparative example 1, as shown in fig. 1, there is no contact point between the heat sink and the winding coil.

A current of 10A was applied for 1 hour to the two sample winding coils implemented as described above, and the temperature was measured after 1 hour and shown in table 2 below.

(Table 2)

From table 1 it can be confirmed that: in the case of assembling the stator of the heat radiating cover of example 1, the low temperature of about 15% level was reached as compared with comparative example 1 without the heat radiating cover, and it was confirmed that the heat generated in the stator can be radiated very effectively.

Although one embodiment of the present invention has been described above, the concept of the present invention is not limited to the embodiments presented in the present specification, and those skilled in the art who understand the concept of the present invention can easily present other embodiments by addition, change, deletion, addition, etc. of components within the same concept, and this is included in the scope of the concept of the present invention.

Claims

1. A stator assembly, comprising:

a stator including a stator core and a winding coil, the stator core being cylindrical and having a through-hole to communicate both ends with an outside, a portion of the winding coil protruding more to the outside in a stator core axial direction than both side ends of the stator core, and a remaining portion being located inside the stator core; and

and heat dissipation covers respectively arranged at two ends of the stator core body and used for accommodating a part of the protrusion of the winding coil inside so as to be contacted with the outer surface of the stator core body.

2. The stator assembly of claim 1,

the winding coil is formed by winding a conductive wire or by fastening and connecting a plurality of hairpins to each other through a plurality of slots arranged along the circumferential direction of the stator core so as to penetrate both ends of the stator core.

3. The stator assembly of claim 1,

the heat dissipation cover has a heat dissipation outer covering material molded to have an accommodation portion accommodating a protruding end portion of the winding coil and a heat dissipation filling material filling a space between the heat dissipation outer covering material and the accommodated winding coil.

4. The stator assembly of claim 3,

in the heat-dissipating outer covering, a through-hole is formed in a central portion of the heat-dissipating outer covering, the through-hole corresponding to the through-hole of the stator core, and a housing portion having an open front end is arranged along a circumferential direction so as to correspond to one end portion of the winding coil projecting therefrom.

5. The stator assembly of claim 3,

the heat dissipation external material is formed by curing an external material resin composition with a first curing base resin and a first heat dissipation filler.

6. The stator assembly of claim 3,

the heat dissipation filling material is formed by curing a heat dissipation filling composition with a second curing base resin and a second heat dissipation filling material after the winding coil is accommodated in the heat dissipation outer packaging material.

7. The stator assembly of claim 3,

the heat dissipation external material is formed by that the tensile strength of KS M3015 is 2.5kg f/mm ² Above, and bending strength of 7.0kg f/mm ² The IZOD impact strength is more than 11 kJ/square meter.

8. The stator assembly of claim 3,

the heat dissipation external material has insulation resistance of 1.0 × 10 ¹³ Omega is more than, arc resistance is more than 180 seconds, and heat distortion temperature is more than 190 ℃.

9. The stator assembly of claim 3,

the volume resistance of the heat dissipation filling material is 2 multiplied by 10 according to ASTM D257 ¹¹ More than omega cm, more than 9 kV/mm in insulation breakdown strength according to ASTM 149 and more than 0.5W/mk in thermal conductivity according to ASTM E1530.

10. The stator assembly of claim 1,

the heat dissipation cover is fixed to the stator core by a fastening member.

11. A heat-radiating cover for a stator is combined with one end part of a stator core body to radiate heat of a winding coil wound on the stator core body of a motor, and is characterized by comprising:

a heat-dissipating exterior material molded to have an accommodating portion accommodating one end portion of the winding coil; and

and a heat dissipation filling composition disposed in the housing portion to fill a space between the heat dissipation casing and the winding coil after housing one end portion of the winding coil.

12. The heat dissipation cover for a stator according to claim 11,

the heat dissipation filling composition includes a second cured base resin in an uncured or partially cured state.

13. A motor, comprising:

the stator assembly of any of claims 1 to 10;

a rotor accommodated in the through-hole inside the stator core of the stator assembly; and

and a housing accommodating the stator assembly to be in contact with an outer circumferential surface of a stator core of the stator assembly, and having a cooling passage at a region corresponding to the outer circumferential surface of the stator core.

14. The motor of claim 13,

at least a portion of an exterior face of a heat sink cap within the stator assembly contacts the housing.